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United States Patent |
6,239,521
|
Lee
|
May 29, 2001
|
Motor cover arrangement
Abstract
A motor cover arrangement for covering a cooling fan of a motor enclosed in
a motor case, wherein the motor cover arrangement includes a cooling fan
cover and an air intake hood. The cooling fan cover has an open outlet end
mounted on the motor case and an inlet end extended from the motor case to
define a fan cavity to dispose the cooling fan therein and an air inlet
opening in front of the cooling fan. The outlet end of the cooling fan
cover defines an air discharge slot between the outlet end and the motor
case to communicate with the air inlet opening. The air intake hood
includes a base shell integrally covering the air inlet opening of the
cooling fan cover and an air intake shell extended from the base shell to
a side portion of the cooling fan cover to provide an air intake window so
as to form an air intake passage between the air intake window positioned
at the side portion of the cooling fan cover and the air inlet opening of
the cooling fan cover. Thereby, fresh air can be sucked by the rotating
cooling fan from outside via the air intake window, the air intake passage
and the air inlet opening to cool down the motor and be discharged through
the air discharge slot, so as to increase both the air sucking effect and
cooling effect.
Inventors:
|
Lee; Wy Peron (11614 Sterling Ave., Suite 103, Riverside, CA 92503)
|
Appl. No.:
|
491497 |
Filed:
|
January 25, 2000 |
Current U.S. Class: |
310/62; 310/47; 310/58 |
Intern'l Class: |
H02K 009/06 |
Field of Search: |
310/47,52,58,62,63
|
References Cited
U.S. Patent Documents
5315193 | May., 1994 | Kummer et al. | 310/50.
|
5701045 | Dec., 1997 | Yokozawa et al. | 310/62.
|
Primary Examiner: Ramirez; Nestor
Assistant Examiner: Jones; Judson H.
Attorney, Agent or Firm: Chan; Raymond Y.
David and Raymond Patent Group
Claims
What is claimed is:
1. A motor cover arrangement for covering a cooling fan of a motor enclosed
in a motor case, wherein said motor cover arrangement comprises:
a cooling fan cover for sheltering around said cooling fan, said cooling
fan having an open outlet end mounted on said motor case and an inlet end
extended from said motor case to define a fan cavity for disposing said
cooling fan therein, wherein an air inlet opening is formed at said inlet
end in front of said cooling fan and an air discharge slot is defined
between said outlet end and said motor case to communicate said air inlet
opening with outside, so that when said cooling fan is driven to rotate by
said motor, said cooling fan sucks in air through said air inlet opening
and discharges said air to outside through said air discharge slot; and
an air intake hood comprising a base shell integrally covering said air
inlet opening of said cooling fan cover and an air intake shell extending
from said base shell to a side portion of said cooling fan cover to
provide an air intake window, wherein an air intake passage is formed
between said air intake window positioned at said side portion of said
cooling fan cover and said air inlet opening of said cooling fan cover,
thereby the air sucked by said cooling fan via said air intake window,
said air intake passage and said air inlet opening to cool down said motor
is discharged through said air discharge slot.
2. The motor cover arrangement, as recited in claim 1, wherein said base
shell of said air intake hood further has an air chamber formed in front
of said air inlet opening of said cooling fan cover.
3. The motor cover arrangement, as recited in claim 2, wherein said cooling
fan cover of said motor cover arrangement is made by molding to form a
circular ring body having a L-shaped cross section, and said base shell
and said air intake shell are integrally made by molding to form said the
air intake hood which is integrally connected onto said cooling fan cover
in air-tight manner so as to cover said air inlet opening and define said
air chamber and said air intake passage.
4. The motor cover arrangement, as recited in claim 2, wherein said cooling
fan cover is partially constructed by a bowl shape cover body and an arc
shape guiding frame, and said air intake hood is formed by an upper
enlarged portion of said cover body.
5. The motor cover arrangement, as recited in claim 4, wherein said cover
body is made by molding to form a single piece body having a ring shaped
connecting rim and a base cover integrally connected to one end side of
said connecting rim, a central portion of said base cover being indented
to form said air chamber, wherein said guiding frame is a C-shape body
having a L-shaped cross section, an upper portion of said connecting rim
being upwardly extended to form a U-shaped portion while a lower portion
of said connecting rim remains in a C-shape portion, wherein two ends of
said guiding frame are integrally connected with two ends of said C-shape
portion of said connecting rim to form said cooling fan cover in circular
shape and define said air inlet opening and said fan cavity between said
C-shape portion of said connecting rim and said guiding frame, wherein a
space defined between said guiding frame and said base cover forms said
air intake window and said air intake passage.
6. The motor cover arrangement, as recited in claim 5, wherein said two
ends of said guiding frame are welded with said C-shape portion of said
cover body when both said guiding frame and said cover body are made of
metal.
7. The motor cover arrangement, as recited in claim 3, wherein a diameter
of said cooling fan cover is larger than a diameter of a supporting brim
provided at one end of said motor case so as to define said air discharge
slot therebetween when said cooling fan cover is mounted on said
supporting brim of said motor case.
8. The motor cover arrangement, as recited in claim 5, wherein a diameter
of said cooling fan cover is larger than a diameter of a supporting brim
provided at one end of said motor case so as to define said air discharge
slot therebetween when said cooling fan cover is mounted on said
supporting brim of said motor case.
9. The motor cover arrangement, as recited in claim 7, wherein a plurality
of spacers are intervally positioned between said cooling fan cover and
said supporting brim of said motor case.
10. The motor cover arrangement, as recited in claim 8, wherein a plurality
of spacers are intervally positioned between said cooling fan cover and
said supporting brim of said motor case.
11. The motor cover arrangement, as recited in claim 9, wherein a plurality
of mounting holes are formed around said cooling fan cover and a plurality
of protruding rings inwardly extended around said mounting holes
respectively to act as said spacers, wherein a plurality of fastening
screws are used to fasten said motor cover arrangement to said motor case
through said mounting holes while said spacers placing and supporting
therebetween.
12. The motor cover arrangement, as recited in claim 10, wherein a
plurality of mounting holes are formed on said connecting rim and a
plurality of protruding rings inwardly extended around said mounting holes
respectively to act as said spacers, wherein a plurality of fastening
screws are used to fasten said motor cover arrangement to said supporting
brim of said motor case through said mounting holes while said spacers
placing and supporting therebetween.
13. The motor cover arrangement, as recited in claim 4, wherein said cover
body is made by molding to form a single piece body having a ring shaped
connecting rim and a base cover integrally connected to one end side of
said connecting rim, a central portion of said base cover being indented
to form said air chamber, wherein said guiding frame is a C-shape body
having a L-shaped cross section, an upper portion of said connecting rim
being upwardly extended to form a U-shaped portion while a lower portion
of said connecting rim remains in a C-shape portion, wherein said guiding
frame is fastened on said motor case to shelter an upper portion of said
cooling fan and said cover body is also fastened to said motor case to
cover said guiding frame and said cooling fan.
14. The motor cover arrangement, as recited in claim 13, wherein a mounting
hole is also provided on said guiding frame for directly screwing said
guiding frame 802' on an upper portion of a supporting brim provided at
one end of said motor case, and a protruding ring is also inwardly
extended around said mounting hole to form a spacer placing and supporting
between said supporting brim and said guiding frame.
15. The motor cover arrangement, as recited in claim 14, wherein a diameter
of said cooling fan cover is larger than a diameter of said supporting
brim provided at one end of said motor case so as to define said air
discharge slot therebetween when said cooling fan cover is mounted on said
supporting brim of said motor case.
16. The motor cover arrangement, as recited in claim 15, wherein a
plurality of spacers are intervally positioned between said cooling fan
cover and said supporting brim of said motor case.
17. The motor cover arrangement, as recited in claim 16, wherein a
plurality of mounting holes are formed on said connecting rim and a
plurality of protruding rings inwardly extended around said mounting holes
respectively to act as said spacers, wherein a plurality of fastening
screws are used to fasten said motor cover arrangement to said supporting
brim of said motor case through said mounting holes while said spacers
placing and supporting therebetween.
18. The motor cover arrangement, as recited in claim 1, wherein said air
intake window is sidewardly opened on top of said motor case.
19. The motor cover arrangement, as recited in claim 3, wherein said air
intake window is sidewardly opened on top of said motor case.
20. The motor cover arrangement, as recited in claim 5, wherein said air
intake window is sidewardly opened on top of said motor case.
Description
BACKGROUND OF THE PRESENT INVENTION
1. Field of Invention
The present invention relates to motors, and more particularly to a motor
cover arrangement which can highly increase the motor's cooling effect,
lower the motor's noise and decrease dust pollution of the motor's
interior so as to prolong the service life span there of.
2. Description of Related Arts
A motor 1 converts electrical energy to mechanical energy wherein the motor
1 comprises a rotor 3 for transmitting mechanical work, electric circuit
terminals 4 for inputting electrical energy, and an induction means 5 for
generating magnetic field. As the electrical energy is input through the
electric circuit terminals 4, a magnetic field is generated by the
induction means 5 so as to generate magnetic force exerted on the rotor 3.
The rotor 3 will be rotated through the magnetic field by means of the
magnetic force and generate mechanical energy.
While the motor 1 converts electrical energy to mechanical energy, it
generates heat energy as well. In order to prevent the motor 1 from
overheating, the motor further comprises a cooling fan 6 coaxially mounted
on a driving shaft 7 outwardly extended from the rotor 3. The rotor 3 is
arranged to drive the cooling fan 6 to be coaxially rotated through the
driving shaft 7 so as to suck the air from outside to cool down the heat
generated in the motor 1.
In order to protect the motor, the conventional motor is disposed in a
motor protective housing 8 for covering the motor 1, wherein the motor
protective housing 8 comprises a motor shell 8a sheltered the motor 1 and
a motor cover 8b coaxially mounted on a side of the motor shell 8b to
cover the cooling fan 6. A plurality of ventilating holes 9 are provided
on the end surface of the motor cover 8b so that air from outside can be
sucked into the motor protective housing 8 by the cooling fan 6 through
the ventilating holes 9 to achieve the cooling effect.
However, when the motor 1 is used in such a tough condition such as driving
a saw blade of a cutting machine, saw dust will also be sucked into the
motor 1 with air through the ventilating holes during operation. The motor
1 may be burned or permanent damage while the saw dust gradually
accumulates to the rotor 3.
SUMMARY OF THE PRESENT INVENTION
A main object of the present invention is to provide a motor cover
arrangement which will highly increase the motor's cooling effect to cool
down the heat of the motor so as to prolong the service life span thereof
Another object of the present invention is to provide a motor cover
arrangement which air inlet is designed to position at an upper portion of
the motor cover to sidewardly suck the fresh air into the motor in order
to lower the motor's noise and decrease dust pollution of the motor's
interior
Another object of the present invention is to provide a motor cover
arrangement which increases both the air sucking effect and cooling effect
by sidewardly intaking fresh air and discharging hot air.
Another object of the present invention is to provide a motor cover
arrangement which is adapted to install to all kinds of motor.
In order to accomplish the above objects, the present invention provides a
motor cover arrangement for covering a cooling fan of a motor enclosed in
a motor case, wherein the motor cover arrangement comprises:
a cooling fan cover having an open outlet end mounted on a supporting brim
of the motor case and an inlet end sheltered around the cooling fan,
wherein the inlet end of the cooling fan cover is extended from the motor
case to define a fan cavity to dispose the cooling fan therein and an air
inlet opening in front of the cooling fan, and that the outlet end of the
cooling fan cover defines an air discharge slot between the outlet end and
the motor case to communicate with the air inlet opening, so that when the
cooling fan is driven to rotate by the motor, the cooling fan sucks in air
through the air inlet opening and discharges the air to outside through
the air discharge slot; and
an air intake hood comprising a base shell integrally covering the air
inlet opening of the cooling fan cover and an air intake shell extended
from the base shell to a side portion of the cooling fan cover to provide
an air intake window so as to form an air intake passage between the air
intake window positioned at the side portion of the cooling fan cover and
the air inlet opening of the cooling fan cover.
Thereby, fresh air can be sucked by the rotating cooling fan from outside
via the air intake window, the air intake passage and the air inlet
opening to cool down the motor and be discharged through the air discharge
slot.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view of a conventional motor.
FIG. 2 is a rear perspective view of a motor cover arrangement according to
a preferred embodiment of the present invention.
FIG. 3 is a front perspective view of the motor cover arrangement according
to the above preferred embodiment of the present invention.
FIG. 4 is a perspective view of a motor mounted with the motor cover
arrangement according to the above preferred embodiment of the present
invention.
FIG. 5 is a perspective view of the motor cover arrangement mounted on the
motor of a cutting machine according to the above preferred embodiment of
the present invention.
FIG. 6 is a partially exploded perspective view illustrating an alternative
mode of the motor cover arrangement, including the motor to be mounted
thereto, according to the above preferred embodiment of the present
invention.
FIG. 7 is an exploded perspective view of another alternative mode of the
motor cover arrangement according to the above preferred embodiment of the
present invention
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring to FIGS. 2 to 5 of the drawings, a motor cover arrangement 80
according to a preferred embodiment of the present invention is
illustrated. As shown in FIGS. 4 and 5, the motor cover arrangement 80 of
the present invention is adapted for covering a cooling fan 72 of a motor
70 enclosed in a motor case 71.
The motor case 71 is a hollow shell body having a first end defining a
circular supporting brim 73 for encasing other motor components therein,
such as the rotor 3, the electric circuit terminals 4 and the induction
means 5 as shown in FIG. 1. A driving shaft 701 is outwardly and coaxially
extended from a second end of the motor case 71 for transmitting a
mechanical energy from the motor 70 to outside. A connecting base 75 is
firmly affixed at a bottom of the motor case 71 for further installing and
stabilizing the motor case 71 in position.
As shown in FIGS. 2, 3 and 4, the motor cover arrangement 80 comprises a
cooling fan cover 81 and an air intake hood 82. The cooling fan cover 81
has an open outlet end 811 mounted on the supporting brim 73 of the motor
case 71 and an inlet end 812 sheltered around the cooling fan 72, wherein
the inlet end 812 of the cooling fan cover 81 is extended from the motor
case 71 to define a fan cavity 813 to dispose the cooling fan 72 therein
and an air inlet opening 814 in front of the cooling fan 72, and that the
outlet end 811 of the cooling fan cover 81 defines an air discharge slot
810 between the outlet end 811 and the motor case 71 to communicate with
the air inlet opening 814, as shown in FIG. 4.
Accordingly, as shown in FIG. 5, when the cooling fan 72 is driven to
rotate by the motor 70, the cooling fan 72 sucks in air through the air in
let opening 814 and discharges the air to outside through the air
discharge slot 810.
The air intake hood 82 comprises a base shell 821 integrally covering the
air inlet opening 814 of the cooling fan cover 81 to form an air chamber
820 in front of the air inlet opening 814 of the cooling fan cover 81 and
an air intake shell 822 extended from the base shell 821 to an upper side
portion 815 of the cooling fan cover 81 to provide an air intake window
823 defined between the upper side portion 815 of the cooling fan cover 81
and the air intake shell 822, so as to form an air intake passage 824
communicating between the air intake window 823 positioned at the upper
side portion 815 of the cooling fan cover 81 and the air inlet opening 814
of the cooling fan cover 81, as shown in FIG. 5.
Thereby, as shown in FIG. 5, fresh air can be sucked by the rotating
cooling fan 72 from outside via the air intake window 823, the air intake
passage 824 and the air inlet opening 814 to cool down the motor 70 and be
discharged through the air discharge slot 810.
As illustrated in FIG. 5, when motor cover arrangement 2 is used to cover
the cooling fan 72 of the motor 70 of a cutting machine 20, cool fresh air
above the motor 70 will be sucked into the fan cavity 813 through the air
intake window 823. It is well known that large amount of saw dust will be
produced during the cutting operation of the cutting machine for cutting
pieces of wood, marble, stone, or ceramic tile. The saw dust will also be
sucked into the motor through the conventional motor cover, as shown in
FIG. 1, because its the ventilating holes are provided very close to the
cutting blade 21 of the cutting machine 20. Moreover, cooling fluid
applied onto the cutting blade 21 and inside the cooling fluid tray 22
will also enter the motor through the ventilating holes of the
conventional motor cover.
However, since the air intake window 823 of the motor cover arrangement 80
of the present invention is designed to sidewardly open on top of the
motor case 71, where the cooling fluid and saw dust are unable to reach,
clean and fresh air above the cutting machine 20 will be sucked into the
air chamber 820 through the air intake passage 824 by means of the
rotating cooling fan 72 covered by the cooling fan cover 81. The cooling
fan 72 will further drive the fresh air from the air chamber 820 to enter
the fan cavity 813 via the air inlet opening 814 and discharge from the
motor cover arrangement 80 through the air outlet slot 810.
In other words, the service life span of the motor 70 can be prolonged by
preventing polluted air and fluid from entering the motor 70. Moreover,
the motor cover arrangement 80 of the present invention can also reduce
the noise of the motor 70. Generally, there is great noise generated in
the conventional motor cover 8b as shown in FIG. 1, caused by the intaking
air directly blowing against the rotating cooling fan 72. The air intake
hood 82 prevents the intaking air directly blowing against the cooling fan
72. Instead, air is sucked into the air chamber 820 through the air intake
window 823 silently and the cooling fan 72 merely drives the air from the
air chamber 820 to cool the motor 70. Therefore, the noise of the motor
can be largely reduced.
As shown in FIGS. 2 and 3, according to the preferred embodiment of the
present invention, in order to facilitate the manufacture of the motor
cover arrangement 80 in low cost and air-tight manner, the cooling fan
cover 81 is partially constructed by a bowl shape cover body 801 and an
arc shape guiding frame 802, and the air intake hood 82 is formed by an
upper enlarged portion of the cover body 801.
As shown in FIG. 3, the cover body 801 is made by mold pressing to form
single piece bowl shape body having a ring shaped connecting rim 816 and a
base cover 817 integrally connected to one end side of the connecting rim
816. A central portion of the base cover 817 is indented to form the air
chamber 820. The guiding frame 802 is a C-shape body having a L-shaped
cross section. An upper portion of the connecting rim 816 is upwardly
extended to form a U-shaped portion which forms the air intake passage 824
while the rest of the connecting rim 816 remains in a C-shape portion. Two
ends of the guiding frame 802 are integrally connected with the C-shape
portion of the connecting rim 816 in air tight manner to form the cooling
fan cover 81 in circular shape and define the air inlet opening 814 and
the fan cavity 813 between the C-shape portion of the connecting rim 816
and the guiding frame 802. Moreover, the space defined between the guiding
frame 802 and the base cover 817 forms the air intake window 823 and the
air intake passage 824.
The two ends of the guiding frame 802 can be welded with the C-shape
portion of the cover body 801 when both the guiding frame 802 and the
cover body 801 are made of metal.
As shown in FIGS. 4 and 5, the diameter of the cooling fan cover 81 is
larger than that of the supporting brim 73 so as to define the air
discharge slot 810 therebetween when the cooling fan cover 81 is mounted
on the supporting brim 73 of the motor 70. The cooling fan cover 81 can be
screwed on the supporting brim 73 of the motor 70 with a plurality of
spacers intervally positioned therebetween.
As shown in FIG. 2, a plurality of mounting holes 83 are formed on the
connecting rim 816 and a plurality of protruding rings 831 inwardly
extended around the mounting holes 83 respectively to act as the spacers,
so that a plurality of fastening screws 84 can be used to fasten the motor
cover arrangement 80 to the supporting brim 73 of the motor case 71
through the mounting holes 83 while the spacers 831, i.e. the protruding
rings, placing and supporting therebetween.
As shown in FIG. 6, an alternative mode of the above preferred embodiment
of the present invention is illustrated, wherein a mounting hole 83' is
also provided on the guiding frame 802' for directly screwing the guiding
frame 802' on an upper portion of the supporting brim 73 of the motor case
71 instead of welding to the cover body 801'. A protruding ring 831' is
also inwardly extended around the mounting hole 83' to form a spacer
placing and supporting between the supporting brim 73 and the guiding
frame 802'. Then, the cover body 801' is fastened to the supporting brim
73 of the motor case 71 by the screws 84 through the mounting holes 83 and
spacers 831, as described in the above preferred embodiment.
FIG. 7 illustrates another alternative mode of the above preferred
embodiment of the present invention, wherein the cooling fan cover 81" of
the motor cover arrangement 80" is made by molding to form a circular ring
body having a L-shaped cross section. The base shell 821" and the air
intake shell 822" of the air intake hood 802" are integrally made by
molding, which is integrally connected by welding onto the cooling fan
cover 81" in air-tight manner so as to cover the air inlet opening 814"
and define the air chamber 820" and the air intake passage 824".
The advantages of the motor cover arrangement 80 of the present invention
include the following:
1. The motor cover arrangement will highly increase the motor's cooling
effect to cool down the heat of the motor so as to prolong the service
life span thereof
2. The motor cover arrangement which air inlet is designed to position at
an upper portion of the motor cover to sidewardly suck the fresh air into
the motor in order to lower the motor's noise and decrease dust pollution
of the motor's interior
3. The sucking effect of the motor will be highly increased by generating a
circulated motion of air cycle in the motor cover arrangement so that more
air will be sucked into the fan cavity through the air intake window for
dissipating the heat of the motor.
4. The motor cover arrangement of the present invention is adapted to
install to all kinds of motor, that is a most simple way to improve the
performance and the noise problem of the motor.
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